When the notch screen is about to flood, the emergence of NEX and Find X has become two resistants, which has led many people to re-examine the brand image of OPPO and vivo, and also forced the vendors to be forced to rethinking and the added value that process design and mechanical structure bring to the product. OPPO Find X not only configures the high-end mainstream Snapdragon 845 processor, but also hides the top earpiece, camera and structured light recognition system by means of the top automatic lifting mechanism, which brings a high screen ratio and eliminates the notch. A little more expensive than NEX, starting at RMB 4,999 (about $750), how is the color and performance of Find X's display?

Seeing OPPO Find X's lifting forehead, some older readers may think of a popular slide-type phone 10-20 years ago? The slider has also appeared on Windows Mobile Phone and later Android smartphones, such as Motorola, Some Android models of the BlackBerry, but as everyone's text input mode has changed to touch screen, the keyboard has become cumbersome, and these "sliding" smart phones have also disappeared. Of course, the lifting mechanism of Find X is much more complicated than the elder ones, and the purpose of the design are not the same. The elder sliders are mainly to protect and hide the physical keyboard, while the Find X is to hide the optical components with a certain width such as the front camera and the structured light sensor. It only automatically stretches out when taking selfies, video calls, and mobile payments.

So, which side of the design of Find X and NEX notchless design is better or smarter? Commonly, both need to add motor, metal arm and other transmission structures on the mobile phone, which is a very cramped mobile phone circuit space, and more severe tests must be been launched. The weight of the precision mechanical transmission structure, the design and mass production are also problems that must be faced, regardless of the front camera or the whole forehead. However, the components of Find X activities are larger, the circuits involved are naturally more, and the areas that require structural reinforcement are also increased [correspondingly, the circuit needs to be more compact], and NEX only needs to pay attention to protect the front camera. In face of unexpected situations that may occur during use, the manufacturer added a self-checking mechanism for accidental drop of the mobile phone, which can be automatically retracted during accidental hand-off. Secondly, the zoom speed of Find X is significantly faster than that of NEX, so users do not need to worry about common use. In addition to relying on these ingenious details to offset the shortcomings, another benefit of Find X's design is that you can safely put important components such as camera and earpiece on the forehead [light sensing is still at the bottom of the screen], no special design is required.

Another highlight of the Find X design is the dual edge-curved AMOLED display, which is rare in domestic mobile phones. Many people consider that the reason why Find X is more beautiful than NEX is that the curved screen can visually reduce the thickness of the borders on both sides or even disappear. The panel hardware provided by Samsung for OPPO and vivo is basically the same, flexible OLED. Whether it adopts curved surface design depends on the needs of mobile phone manufacturers. The screen to body ratio of Find X is therefore over 93%, but the difference in the thickness of the border at the bottom of the screen is not obvious. In addition, the grip and weight control are relatively better than NEX S and Find X's 186 grams is lighter than NEX S. However, the 3.5mm headphone jack has been eliminated, but on the other hand, it can also be considered to match the Type-C headphone active adapter of Musiland or HTC or directly connect to the more mainstream Bluetooth wireless headset.

Find X runs Android 8.1 based Color OS 5.1 system with a screen resolution of 2340x1080. The specification is lower than the QHD+ level of the Samsung Galaxy S9 series. The AMOLED panel is arranged in a diamond-shaped Pentile, and the pixel density is slightly lower than the nominal 401 PPI. In the system display settings, the color temperature adjustment function is directly provided. Does this make the color performance of Find X better? By convention, the objective performance index test of color and brightness of the screen is completed by SpectraCal Calman. If there is no special statement, the objective indicators are all completed in SDR display mode.

Max Screen Brightness (cd/m2 or nits): The maximum brightness one screen could reach, without considering glass quality, algorithm or dynamic adjusting. Over 500 cd/m2 can be used under strong light, below 400 cd/m2 will be to use.Gamma 2.2: Gamma value is the key factor in contrast display. Our eyes do not perceive light the way cameras do. Under sRGB, if the gamma value is 2.2, the tonal range is just what human eyes receive. Lower than 2.2, the contrast will go down, otherwise, it will go up. Except the gamma value, we have to see form the picture if the red, green and blue curve overlap, if not, different color contrast will be different. The value between 2.1 to 2.3 is qualified for display, while if the value is below 2 or over 2.4, the contrast will be lower or higher than standard.Average Color of White: The average color temperature in degrees, D65 with 6500 K is the standard color of White for most Consumer Content and needed for accurate color reproduction of all images. Higher than 6500K will tend to be cold, otherwise will be warm.
Color difference: A measurement used to indicate how much a color deviates from standard. The higher the ¦¤E, the more inaccurate the color. This is because the human eye is only capable of detecting color difference at certain thresholds. It is hard to detect if average ¦¤E is below 5, less than average 3 ¦¤E and less than 5 ¦¤E is excellent, the smaller the ¦¤E is, the better the color is. Between 5 to 10 ¦¤E is detectable, over 10¦¤E is significantly detectable. Color Gamut(sRGB): The specific range of colors that one device is able to display. Our test is based on sRGB. If wide-gamut device is tested, Adobe RGB or NTSC gamut will be noted for reference. Display with over 90% will be enough for everyday use, higher than a certain percentage will not affect using experience significantly. However, photo playback requires precisely range, 10bit video requires wider gamut.
Restricted by our devices, we will not test the viewing angle. On average, more than 30 would bring over 50% brightness loss.

Grayscale and Color Performance

Unexpectedly, Find X not only provides color temperature adjustment, but also defaults color temperature and color to the default DCI-P3 color gamut mode. The color temperature is lower than the 6500K standard. However, Find X's Gamma grayscale curve is not smooth, although it remains at the standard 2.2 level, but the actual color tone is slightly purplish at the standard color temperature, so the grayscale and color errors cannot be improved by the color temperature adjustment.

Find X color display always maintains P3 color gamut display, no icc adaptive or sRGB color mode can be switched, so the color of the mobile apps in the warmer color of the browsing interface will be slightly super saturated and glare, the reference color of the picture color is not high. Find X supports HDR10 video playback, but the system built-in decoder does not support the audio decoding of common 4K HDR sources, resulting in silent movies. Of course, HDR10 video is not popular in China and will not affect the actual use.

Experience

The AMOLED panels of the iPhone X, NEX, and Find X models need to be used in conjunction with the touch layer. This is also the case that such OLED mobile phones are not black enough when their display screens are off, or they are "greasy" or discolored at a certain viewing angle. The reason for this is that the screen reflection of Find X is less than that of OPPO's R series mid-range models, but the red and green alternating color distortion in the side view still exists. Find X has a typical brightness of 430 cd/m2. When used in outdoor sunlight, the overall visibility is inferior to that of NEX or iPhone X. Of course, this level of brightness is already acceptable for OLEDs. The AMOLED response speed has always been an advantage over the TFT. The delay can be easily controlled within 10 milliseconds. There is no obvious smear phenomenon, and the screen refresh rate can be stabilized at 60 Hz.

Since the proportion of the screen reaches 19.5:9, some third-party applications will not be able to adapt to the display ratio and leave a blank. Similar to NEX, Find X also adopts the third-party application automatic detection prompt and manual switching to ensure compatibility. Some Android apps that are rare in China can be forced to switch in the display settings after installation.

Conclusion

Find X's screen is better in grayscale, color and brightness than the mid-end products of OPPO, and the combination of the top lift design and the dual edge curved full vision display screen is also very impressive. However, when directly compared with NEX, Samsung Galaxy S9 competitors, the Find X screen is relatively inferior in the main objective color indicators and outdoor sunlight. Providing color temperature adjustment is also a step further for OPPO. There is still potential for such a flagship.